The 'cell of origin' of the second most common lung cancer and the way that it becomes dominant in the lung have been ...

The trunk is your trachea, or windpipe. It splits into smaller and smaller branches in your lungs. At the end of each branch are tiny air sacs called alveoli. This is where oxygen goes into your ...

cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and goblet cells to clean the air before it reaches the lungs Goblet cells produce mucus which traps dust ...

This week, archaeologists identified depictions of the Milky Way galaxy in ancient Egyptian imagery. A mathematician found a ...

The respiratory system consists of the upper and lower respiratory tracts. The upper respiratory tract includes the nasal cavity, paranasal sinuses, and nasopharynx. The lower respiratory tract begins ...